Experimental new pass manager breaks libFuzzer
Categories
(Firefox Build System :: Toolchains, defect)
Tracking
(firefox76 fixed)
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| firefox76 | --- | fixed |
People
(Reporter: decoder, Assigned: decoder)
Details
Attachments
(1 file)
It looks like -fexperimental-new-pass-manager has the potential to break libFuzzer instrumentation: I was just debugging an issue on oss-fuzz where the resulting build claimed that no instrumentation was detected. I traced it back to the new pass manager and indeed building with --disable-new-pass-manager solved the problem there.
At the same time, our own builds seem to still work for some reason (oss-fuzz uses our toolchain so I really don't know for sure where the difference is). But I suggest that for now, we disable the new pass manager in fuzzing builds.
Could you point me to a broken oss-fuzz build and a successful Mozilla one? I would be interested in examining them.
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Assignee | |
Comment 2•4 years ago
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(In reply to :dmajor from comment #1)
Could you point me to a broken oss-fuzz build and a successful Mozilla one? I would be interested in examining them.
Nevermind, I just fetched another TC build and it also appears to be broken... My local build is ok, but that uses a newer Clang.
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Assignee | |
Comment 3•4 years ago
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Updated•4 years ago
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Pushed by choller@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/c695eb5a7bc4 Disable new pass manager for fuzzing when using older Clang. r=dmajor
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Comment 5•4 years ago
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| bugherder | ||
Description
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